One of these days I really need to scan the prize 
of my non-anime cel collection, a magnificent 
production cel of practically all the characters 
from Goof Troop (my favorite of the Disney TV 
series), framed side by side with matching sketch.

This was purchased from a Disney Store location 
about three years ago, as a birthday present from 
my hubby.  And if I recall correctly, it was only 
about $300.

So while Disney movie cels might be a fortune and 
a half to find and buy, the TV cels are available 
and affordable.  :)